EP1547704B1 - Rocker arm of sheet metal and its method of manufacturing - Google Patents

Rocker arm of sheet metal and its method of manufacturing Download PDF

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Publication number
EP1547704B1
EP1547704B1 EP04030670A EP04030670A EP1547704B1 EP 1547704 B1 EP1547704 B1 EP 1547704B1 EP 04030670 A EP04030670 A EP 04030670A EP 04030670 A EP04030670 A EP 04030670A EP 1547704 B1 EP1547704 B1 EP 1547704B1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
diameter
pair
hole
axial holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04030670A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1547704A1 (en
Inventor
Yoshitaka c/o Koyo Seiko Co. Ltd. Waseda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JTEKT Corp
Original Assignee
JTEKT Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JTEKT Corp filed Critical JTEKT Corp
Publication of EP1547704A1 publication Critical patent/EP1547704A1/en
Application granted granted Critical
Publication of EP1547704B1 publication Critical patent/EP1547704B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B21K1/205—Making machine elements valve parts rocker arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49295—Push rod or rocker arm making

Definitions

  • the present invention relates to a rocker arm made of sheet metal for a valve mechanism of an automobile engine, and a method of manufacturing the same.
  • the rocker arm furnished to the valve mechanism of the automobile engine is provided with a body made of sheet metal, a roller disposed between side walls of the body, and an axis for rotatably supporting the roller via needle rollers.
  • the axis is non-rotatably inserted in axial holes formed in the side walls of the body.
  • a rotation of cam in contact with the roller oscillates the body, and the valve stem is vertically moved in cooperation with this oscillation to open and close a valve (see, for example, Patent Laid Open No.2001-55912 ).
  • the body of the rocker arm receives load from the cam via the roller.
  • the surrounds of the axial holes through which the axis passing through the body is inserted receives large load. Therefore, for securing rigidity in response to load, the sheet metal having thickness durable against the load is employed for the material of the body, so that the weight of the rocker arm increases by such an amount of the durable thickness.
  • the axial holes are formed by punching the sheet metal by an amount of the diameter of the axis, and punched circular parts are scrapped as they are, resulting in lowering yield rate.
  • JP 06 079383 A discloses a rocker arm comprising a body that is made of sheet metal and includes a pair of side walls; and a pair of axial holes that are respectively formed through the pair of side walls and have a first diameter and through which an axis is inserted, wherein the pair of axial holes include thickened portions formed partially or overall of circumference of the pair of axial holes, and wherein the thickened portion is formed by expanding a hole that has a second diameter smaller than the first diameter and is formed in a pre-arranged range for forming the axial hole in a blank material so as to cause plastic flow in a metallic material of the circumference of the hole.
  • an object of the present invention is to provide a rocker arm in which weight is reduced, and a desired rigidity is secured.
  • Figure 1 is a perspective view showing the disassembled rocker arm
  • Figure 2 is a cross sectional view showing a using condition of the rocker arm
  • Figure 3 is a cross sectional view of a central part in the longitudinal direction of the rocker arm
  • Figure 4 is a plan view of the blank work
  • Figure 5 is a cross sectional view showing a processing procedure of the body.
  • reference numeral 1 denotes a cam
  • reference number2 denotes the rocker arm.
  • the cam 1 is rotatably furnished around a cam shaft 3 at a predetermined position of the valve mechanism (not shown).
  • the rocker arm 2 is used to OHC type engine, and is provided with a body 4 made of sheet metal, roller 5, needle rollers 6 turnably disposed at the side of an inner diameter of the roller 5, and an axis 7 inserted at the side of an inner diameter of the needle rollers 6.
  • the body 4 includes a pair of side walls 8, 9 being parallel to each other.
  • the axis 7 is bridged between both side walls 8, 9 and non-rotatably attached to the side walls 8, 9 by fitting the axis 7 to circumferential faces of the axial holes 8a, 9a and expanding opposite end faces 7a, 7b outside in the radial direction.
  • the outer circumferential portions of the axial holes 8a, 9a are formed to be thickened portions 10, 11 having thickness t2 larger than thickness t1 of blank materials of opposite side walls 8, 9 constituting the body 4.
  • t2 1.5 x t1.
  • Such thickened portions 10, 11 are formed by causing a metallic material to generate plastic flow when forming the axial holes 8a, 9a.
  • a lash adjuster carrier 12 is provided between both opposite side walls 8, 9 at one side in the longitudinal direction of the body 4.
  • a lash adjuster 14 slidably fits at its front end to the lash adjuster carrier 12.
  • a valve carrier 13 is provided between opposite side walls 8, 9 at the other side in the longitudinal direction of the body 4.
  • the valve carrier 13 is incorporated with a front end 15a of a valve stem 15.
  • the body 4 is produced by pressing one sheet of metallic sheet, and opposite side walls 8, 9, lash adjuster carrier 12 and valve carrier 13 are formed as one body.
  • the body 4 of the above structure is made of the sheet metal.
  • the first step is to perform a die-cutting treatment on one sheet of metallic sheet by a pressing process so as to produce a blank material 18 as shown in Figure 4.
  • This case employs such a metallic sheet being thinner than metallic sheets used to forming of conventional rocker arms.
  • reference numerals 19, 20 denote pre-arranged ranges for forming the side walls 8, 9
  • reference numeral 21 denotes the pre-arranged range for forming the lash adjuster carrier 12, and
  • reference numeral 22 denotes the pre-arranged range for forming the valve carrier.
  • Reference numerals 23, 24 denote the pre-arranged ranges for forming the axial holes 8a, 9a. At a stage of this blank material, sizes of diameters d1 of holes 23a, 24a formed in the pre-arranged ranges for forming the axial holes 8a, 9a are in advance prepared to be enough smaller than the diameter d2 of the axis 7.
  • the diameter d1 of the holes 23a, 24a of the pre-arranged ranges 23, 24 is expanded for forming the axial holes 8a, 9a by means of a suited jig 25.
  • the expansion process is performed under a condition of holding the blank material 18 at its one side on a metal mold 28.
  • the metal mold is formed with a releasing part 27 corresponding to the ranges of the axial holes 8a, 9a, and the jig 28 is positioned to the holes 23a, 24a of the pre-arranged ranges 23, 24 for forming axialholes8a, 9a, and presses the other side of the blank material 18.
  • the holes 23a, 24a are expanded, and the metal material by an expanding amount is effected with plastic flow in order to increase thickness as swelling with respect to the pre-arranged ranges 19, 20 so that thickened portions 10, 11 are formed.
  • the pre-arranged ranges 19, 20 that form the side walls 8, 9 are bent at the positions shown with imaginary lines 18a, 18b of Figure 4 by a determined metal mold (not shown) so as to form the body having the side walls 8, 9, the lash adjuster carrier 12 and the valve carrier 13 as shown in Figure 1.
  • a assembly in which the needle rollers 6 are arrangedon the inner circumference of the roller 5 is disposed between the side walls 8, 9 as shown in Figure 1.
  • the axis 7 is inserted from one-side axial hole 9a toward the other axial hole 8a, and is fitted to the circumferential face of the axial holes 8a, 9a of the side walls 8, 9 and is expanded at opposite ends 7a, 7b outside in an axial direction so that the axis 7 is non-rotatably attached to the axial holes 8a, 9a.
  • the body 4 oscillates around a fulcrum of a front end 14a of the lash adjuster 14, whereby the valve stem 15 is vertically reciprocated to open and close the valve of the engine.
  • the axial holes 8a, 9a secure rigidity at the outer circumference of the axial holes 8a, 9a in such manners that, when forming the axial holes 8a, 9a, the metallic material of the blank material is caused with the plastic flow to make the thickened portions 10, 11 thicker than the thickness of the blank material blank metal material of the side walls 8, 9. Therefore, in this rocker arm 2, even if using the material thinner than the blank material of the body of the conventional rocker arm, the cam 1 is enough durable against such load from the cam 1, and as a result, the rocker arm 2 is enough durable in the severely using circumstance of the valve mechanism of the engine, while realizing reduction in weight by using the thin metallic sheet of the body 4.
  • the body 4 is formed with the metallic sheet thinner than the conventional ones, and the axial holes 8a, 9a are formed so that the holes 23a, 24a are expanded for causing the plastic flow in the thickness of the metallic sheet, an amount of scrappingmetal parts is considerably reduced, and accordingly the body 4 of the rocker arm 2 can be heightened in a yield of production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Forging (AREA)
EP04030670A 2003-12-25 2004-12-23 Rocker arm of sheet metal and its method of manufacturing Expired - Lifetime EP1547704B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003429613A JP2005188362A (ja) 2003-12-25 2003-12-25 板金製ロッカアームおよびその製造方法
JP2003429613 2003-12-25

Publications (2)

Publication Number Publication Date
EP1547704A1 EP1547704A1 (en) 2005-06-29
EP1547704B1 true EP1547704B1 (en) 2007-07-11

Family

ID=34545014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04030670A Expired - Lifetime EP1547704B1 (en) 2003-12-25 2004-12-23 Rocker arm of sheet metal and its method of manufacturing

Country Status (6)

Country Link
US (1) US7222599B2 (https=)
EP (1) EP1547704B1 (https=)
JP (1) JP2005188362A (https=)
KR (1) KR20050065419A (https=)
DE (1) DE602004007466T2 (https=)
ES (1) ES2289420T3 (https=)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7631425B2 (en) * 2004-12-17 2009-12-15 Nakanishi Metal Works Co., Ltd. Method for manufacturing rocker arm
DE102006048342A1 (de) * 2006-10-12 2008-04-17 Schaeffler Kg Schlepphebel
DE102011007450A1 (de) * 2011-04-15 2012-10-18 Schaeffler Technologies AG & Co. KG Schlepphebel eines Ventiltriebs und Verfahren zu dessen Herstellung
DE102011079605A1 (de) * 2011-07-22 2013-01-24 Schaeffler Technologies AG & Co. KG Schlepphebel für den Ventiltrieb einer Brennkraftmaschine
JP6721374B2 (ja) 2016-03-29 2020-07-15 株式会社オティックス ロッカアーム及びロッカアームの製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0679383A (ja) 1992-05-29 1994-03-22 Toshiomi Hayashi ロッカーアームの製造方法
US6516766B2 (en) * 1997-04-23 2003-02-11 Koyo Seiko Co., Ltd. Rocker arm
US5943897A (en) * 1997-04-30 1999-08-31 Exedy Corporation Method for making a hole in a plate and a punch for making such a hole
US6199527B1 (en) * 1998-03-12 2001-03-13 Nsk Ltd. Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof
JP4099909B2 (ja) 1999-08-18 2008-06-11 株式会社ジェイテクト ロッカアーム胴体の製造方法
JP2001271614A (ja) 2000-03-27 2001-10-05 Toyota Motor Corp ロッカアーム及びその製造方法
ATE364796T1 (de) * 2000-06-08 2007-07-15 Adval Tech Holding Ag Hohlnietverbindung zwischen zwei blechen und verfahren zu ihrer herstellung
JP2003056314A (ja) 2001-08-22 2003-02-26 Nsk Ltd ロッカーアーム
JP2003328704A (ja) 2001-11-22 2003-11-19 Ntn Corp ロッカーアーム

Also Published As

Publication number Publication date
KR20050065419A (ko) 2005-06-29
DE602004007466T2 (de) 2008-03-13
EP1547704A1 (en) 2005-06-29
ES2289420T3 (es) 2008-02-01
US7222599B2 (en) 2007-05-29
DE602004007466D1 (de) 2007-08-23
JP2005188362A (ja) 2005-07-14
US20050199204A1 (en) 2005-09-15

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